text: n,l=input().split()
  n=[i for i in input()]
  i=0
  while i<int(l):
      j=0
      while j<len(n)-1:
          if n[j]<n[j+1]:
              n[j],n[j+1]=n[j+1],n[j]
              j+=1
          j+=1
      i+=1
  print(''.join(n))
  